9psi middle spring for the GFB EX50 external wastegate. Combine with the 7psi inner and 13psi outer springs for boost pressures of 7, 9, 13, 16, 20, 22 and 29psi.

Genuine GFB (Go Fast Bits) part, supplied by Boosted Performance Parts, Sydney. Not sure it suits your car? Contact us with your make, model and mods before ordering.